Attachment-plug.



T. 'A. G. BOTH. ATTACHMENT .PLUG. 12131101111011 M11111) 11112122, 1910.

985,775.- 1 P n d Mar- 7, 1911.

' 2 SHEETS-SHEET 1.

T. A. G. BOTH.

ATTACHMENT PLUG.

APPLICATION FILED SEPT. 2, 1910.

985,775. v Patented Mar. 7,1911. I I 2SHEETS-SHEBT2.

ATTORNEY granted to UNITED STATES PATENT OFFICE.

TON-TIES AUGUST CARL BOTH, OF NEW YORK, N. Y., ASSIG'I Q'OB TO IDA S. BOSENHEIM,

' OF NEW YORK,

ATTACHMENT-PLUG.

Specification 6: Letters Patent.

Patented Mar. 7, 1911.

Application filed September 2, 1910. SeriaLNo. 580,242.

new .and useful Improvements in Attack.

merit-Plugs, of which the following is a specification, taken in connection with the accompanying drawings, which form a part of the same.

This invention relates to attachment plugs and is an improvement upon' United States Patent No. 845,712, dated February 26, 1907,

signee of The present invention covers an improved attachment plug wherein the number of arts in the patents referred to is reduced,

which among other advantages permits the plug to be made smaller, plifies the construct-ion, and reduces the cost of manufacture.

' It also covers certain details of construction all of which will be hereinafter more fully described and set forth in the claims.

In the accompanying drawings showing illustrative embodiments of my invention and in which the same reference numerals refer to similar parts in the Several figures :Figure 1 is a vertical section through my improved attachment plug. Fig. 2'is a vertical section through the cap removed from the lower portion .of the base of the plug; Fig. 3 is a vertical section through the base (if the plug; Fig. 4-. is a plan view of the cap wi h the cover removed; Fig.5 is a bottom plan view of the base of the plug; Fig. 6 is a'perspeetive view of one form of spring contact; Fig. 7 is a side elevation of 'the cap with the cover omitted; Fig. 8 is a.

detail perspective view of the eccentric stud; Fig. 9 is a plan view of the cap with the cover omitted, showing amodified arrangement of screw threads; Fig. 10 is a modified form of spring contact; Fig. 11 is a plan view of the blank from which the contact shown in Fig.

showing-the manner of mounting the spring contact shown in Fig. 10. Fig. 13 is a Ralph A. Schoenberg, asthe as. C. J Klein and United States, Patent No. 935,523 granted September 28,

body

and generally sim- 10 is preferably made; Fig. 12 is a side elevation of the modification.

side elevation partly broken away; Fig. 15 is a plan view showing the preferred manner of mounting the screw threads; and Fig. 16 is a side elevation of the structure shown in Fig. 15, partly broken away.

In. the illustrative embodiments of the invention shown 1 is an attachment 'plug formed of a base 2 and cap 3. The base consists of the screw shell contact 4 and an insulating body member 5 which fits within the bottom portion of the screw shell contact 4:. The bottom 6 of the screw shell contact is provided with. a central aperture 7 through which extends a reduced apertured foot 8 of the body member 5.

I hollow out the central portion of the member 5 forming a single central cavity 9for the reception of'the spring tension conducting member 10 which is secured to the center contact 11. This center contact is preferably in the form of a screw, its head 12 being the center contact of the attachment plug 1. while its screw threaded stem 13 cooperates with and secures the springtension conducting member 10, Fig. 1.

On the upper portion of the screw shell contact 4 I secure a guard ring or non-conducting member 14 preferably byrovidmg its inner circumference with a shel or shoulder 15 at some distance beneath its upper surface 16 so as to permit the'end 17 of the screw shell contact 4;, after the ring 14 has been properly positioned on the screw shell contact, to be swaged or otherwise bent until it lies upon and cooperates with the shelf or shoulder 15. To prevent this guard ring from moving down upon the screw shell 4, or otherwise becoming displaced the screw shell is preferably provided with two or more outwardly extending lugs 18, 18 Figs. 1 and 5, by pressing the metal of the screw shell outwardly or by otherwiseforming the or any other suitable mprevent their relative rotation,

the screw shell 42. This can be done with any suitable tool.

The cap 3 for purposes of radially attaching the feed wires and 21 is formed 15 into two detachable portions; an insulating body member 22, preferably formed of porcelain and a removable cover 23, the two being preferably connected by a screw thread 24 which may be formed integral 2 with the insulating body member 22, Fig. 2.

2 tion to each other,

gered for the member 22 screw This screw thread 24, to permit the'molds to be readily withdrawn after molding the insulating portion or body member 22 has its respective ends 25, 25 staggered with relaso that .the upper mold (not shown) can be readily withdrawn from elower one, this staggered feature more clearly shown in Fig. 7. The female screw thread in" the cover 23 is alsostagsame reason. I also preferably make this screw thread 24 square in cross section which I have found particularly advantageous in practice in that it insures the cover 23 snugly fitting the body without any lost motion or tendency to rattle.

To permit the molds to be readily separated m molding the insulating body memher 5 I also provide it with a. single integral thread 124, Fi s. 1, 2, and 14, having its ends 125 and 125 not quite encircling the member and arranged staggered with relav tion to each other.

I The lower surface of the body member 22 is formed into a dome or concave surface 26 to lating body a recess or rabbeted portion 28 in the dome or' cotiper-ate with the crown or convex surface 19 of the lower insulating member 5," for a' pointed out. Within the center of the insumember 22 I mount a short stud 27 to "cotiperate with the spring tension con- ;ducting member 10. To insure the entire attachment plug, and more particularly the cap, to be made as small as possible I mount this center stud 27 in a peculiarmanner. As -'shown in Figs. land 2 it is mountedin a concave surface 26 of the'insulating member '22., 'Eceentrically mounted upon this studand 8, which passes I 27 a,stem 29, Figs. 1 2

hrough the member 22 and through the binding plate 30, Fig. 4, its end being upset as shown in Fig. 1. In this manner the binding plate 30 is secured to the stud 27.

y reference to the dotted lines in Fig. 4, in-

being ,stru ction wherein the binding binding screws 32 and 33would have to be increased and consequently the entire area of the body member 22 would have to be enlargcd which would of necessity enlarge the entire cap of the attachment plu By mounting the stud 27 in the recess 28, *igs. l and 2, of the member 22 I insure that the axis of the stud will alwayscoincide with the axis of the body member 22 even though the eccentric stem 29 is employed. Consequently the stud 27 will always be in the proper po sition to cooperate with the tension conducting member N o. 10.

to the binding screw 32 while the other feed wire 20 is connectedto the binding screw 33 secured to the bindingplate 31. Beneath this binding plate '31 I molmt a spring contact member 34, Fig. 6, formed of a bridge piece 35 and two downwardly extending spring arms 36, 36. This bridge piece 35 is formed of sufficient length to permit the spring contactarms 36, 36 to become seated in the recess 37, 37 of the body member 22 and to preferably extend slightly beyond the periphery of said member so as to make direct .contact with the shell contact 4. The bridge piece 35 and the bindin plate 31 aresecured together and to the b y member 22 by any su table means vsuch as by the screw 38, Fig. 2. v i

, The tension conducting member 10, which is connected to,the center contact '11 and cooperates with the stud 27, is preferably formed out of a single piece of spring metal hold the stud 27 against accidental disconnection. Each arm or fork of this member l0 is also provided near its with another crimp or bend 41- whichmaterially prolongs the life of this spring member and increases its resilienc In some instances where it may not be desired to cast the screw thread 24 upon the body member 22 1 form the screw thread of metal or other suitable material and connect it to the b ding plates. By way of example-I have shown in Fig, 9 such -a-c01 1- provided with an arm 45 and.tlns arm has two wings 46, 46 whicharebent" to conform with. the circumference of the body member and partly surround it. The similar binding plate 47 is also provided with an arm 48 and two wings 49, 49 which are also made to conform to the circumference of the body member 22 and partly surround it; sufiiclent gaps 50, 50 being left between the purposes of description it will be considered that the feed wire 21 is connected lower portion respective arms 46, 46 and 49,49 to prevent r short circuiting or sparkmg. The respective binding plates 44 and 47 to ether with their respective arms 45, 48, an

be accomplished for exthe arms48 of a little the arm 45, and correspondingly shaping the respective wings .to form a spiral or thread.

In the preferred construction and 16 I form. the binding plates 131 with preferably integral depending flanges provided with a screw thread 224 the flanges being separated from each other.

.Figs. 15 130 and The plates are also separated from each- .other by preferably a ridge 132 carried by 20 the insulating body member.

In some cases instead .qf making the spring contact 34 as shown in Fig. 6, I may make this contact in the form of a ring 51, preferably a split one. and preferably form it. from a blank 52, Fig. 11-, the completed ring being illustrated in Fig. 10. This ring isprovided with two integral arms and 54, .their ends overlapping each other. When such a ring is used instead of forming recesses 37. 37 in the body-member 22 of the cap I reduce the lower portion of the body member 22, Fig. 12 forming a circumferential groove 55 for the reception of the ring 51, it of course being imderstood that in both 5 constructions the ring 51 as well as the arms 36, 36 contact directly with the screw shell contact 4 of the attachment plug.

In using my invention the feed wires 20 and 21 are passed through" the opening 56 40 in the cover 23, the cover'being given a revolution to disconnect it from the body member 22, so that the ends of the feed wires can be connected to, their respective binding posts 32 and 33. Current being supplied for example through the feed wire 21 to the binding post 32 will pass through the binding plate 30. stem 29, stud 27, tension member 10. center contact 11 through the electric light or other consuming device and back through the shell contact 4, spring arms 36. 36, which are in direct contact with theshell contact 4,"and then" out. through the binding plate 31 and feed wire 20. a

By forming the body member 22 with a wings 46,. 5 46 and 49, 49 are preferably stamped out of form a slight spiral or 'current the spring arms 36,

dome or concave surface and the .body memformed by the disconnection of the cap from the base and consequently they prevent any damage being done by the arc.

The parts are so proportioned that in whatever manner the electrical connection is broken, whether by astraight pull or by an angular blow or twist the current is first broken between the stud 27 and the spring tension member 10 and while these parts are surrounded by the convex and concave surfaces carried respectively by the base and cap. After this disconnection of the withdrawn from contact with the screw shell 4. There will, however, be no arcing on the disconnection of these latter elements.

.In the construction shown in Figs. 9. 15, and 16,- the metallic'screw threads, which will become charged, are received and entirely surrounded by the insulating cover 23 so that they cannot endanger the operator or short-circuit the current,

In all forms shown of cap and base are swivelly and separably connected together so that they can be separated by either a pull in a horizontal line or by rockinw or pulling them atan angle to each other; the latter operation being known as angular separation of the parts.

Having thus described this invention in connection with several illustrative embodiments thereof to the details of which 'I do notdesire to be limited, what is claimed as new and what it is desired to secure by Lettgrs Patentis set forth in the appended 0.21125. 1

1. In an attachment plug the combination of a metallic screw shell, a hollow insulating member held within the screw sulating member being provided with a cavity and with a convex surface, a second insulating member provided with a concave surface to cooperate with the convex surface of the other insulating member and side con tacts carried by the second insulating mem-- her to contact directly with the screw threads of the first member and cooperating detachable center contacts carried by the hollow insulating member and by the second insulating memben' I 2. An attachment plug comprising a screw shell contact, an insulating body member mounted within the screw shell contact and provided with a central aperture and with a convex head, a spring contact mounted in the-opening in the body member, 'a center contact connected to said spring contact, a detachable cap provided with a centrally mounted studto coo rate with the spring contact and with spring contacts adapted to contact directly with the screw shell contact.

3. An attachment plug comprising a screw shell contact, an insulating body memmy im'ention the shell, said in- 36 will. then be V ber mounted within the screw shell contact with a convex head, a spring contact mountducting guard ring secured to the upper ed in the opening in the body member, a cenedge of the shell, an insulating. body memter contact connected to said spring contact. ber mounted in the shell, said insulating a detachable cap provided'with a centrally body'member being, of less height than the mounted stud to cooperate with the spring height of the shell thereby leaving a portion 40 contact mountedin the opening in the lower of the interior surface of the shell exposed, a body member, said stud being provlded with center contact, mounted in the insulating 'an eccentrically mounted stem, and spring body member, and a detachable cap probody member of the cap.

contacts adapted to contact directly with the vided with a center contact to contact with screw shell contact. the center contact of the base and also pro- 4. A cap for an attachmentplug comprisvided with abridge piece and two downing an insulating member and cover, a stud, wardly extending spring arms to directly binding plates, and means carried by the contact with the exposed surface of the shell. binding plates to secure the cover to the 8. In an attachment plug the combination of a base provided with a shell, "an i'nsulat- 5. A cap for an attachment plug comprising body member mounted in the shell, said ing an insulating member and cover, a stud, insulating body member being of less height binding plates, and screw threads carried by than the height of the shell thereby leaving the binding plates to secure the cover to the a free portion of the surface of the shell to body member of the cap. form one element of an electrical connection, 6. In an attachment plug the combination I a center contact carried by the insulating of a base provided with a shell, an insulat body membexyhavmg an electrical contacting body member mounted in the shell, said ing surface of less length than that of the insulating body member being of less height free portion of the shell, a detachable cap than the height of the shell thereby leaving provided witha center contact to cooperate a portion of the interior surface of the shell with the center contact of the base and with a exposed, a center contact mounted in the inbridge piece and two downwardly extending sulating body member, and a detachable cap spring arms to contact with the free portion provided with a center contact to contact of the shell, thereby insuring that the cenwith the center contact of the base and also fer Contact is disconnected before the shell provided with a bridge piece and two downcontact.

wardly e xtending spring arms to directly TONJES AUGUST CARL BdTlI. contact wlth the exposed surface of the shell. Witnesses:

7. .In an attachment plug the combination LEON STRAUSS,

of a base provided with a shell, anon-con- MARTIN F. BALDWIN. 

